4. Macbeth's ambition and not his wife was the cause of his ruin.
5. Macbeth's wife was the cause of his ruin.
+Theme CI.+—Select one of the subjects in the exercise above, and write out two or three of the strongest arguments in its favor.
(Consider the premises, especially those which are not expressed. Is
your argument deductive or inductive?)
+183. The Basis of Belief.+—If you ask yourself, Why do I believe this? the answer will in many cases show that your belief in the particular case under consideration arises because you believe some general principle or theory which applies to it.
One person may believe that political economy should be taught in high schools because he believes that it is the function of the high school to train its pupils for citizenship, and that the study of political economy will furnish this training. Another person may oppose the teaching of political economy because he believes that pupils of high school age are not sufficiently mature in judgment to discuss intelligently the principles of political economy, and that the study of these principles at that age does not furnish desirable training for citizenship. It is evident that an argument between these two concerning the teaching of political economy in any particular school would consist in a discussion of the conflicting general theories which each believed to be true.
We have shown in Section 179 that one high school principal might believe that boys should be allowed to choose their own studies because he believed that they would not generally select the easy ones; while another principal would oppose free electives because he believes that boys would choose the less difficult studies. The proposition that "The United States should retain its hold on the Philippines" involves conflicting theories of the function of this government. So it will be found with many of our beliefs that either consciously or unconsciously they are based on general theories. It is important in argument to know what these theories are, and especially to consider what may be the general theories of those whom we wish to convince.
+184. Appeals to General Theory, Authority, and Maxims.+—A successful argument in deductive form must be based upon principles and theories that the audience believes. A minister in preaching to the members of his church may with success proceed by deductive methods, because the members believe the general principles upon which he bases his arguments. But in addressing a mixed audience, many of whom are not church members, such an argument might not be convincing, because his hearers might deny the validity of the premises from which his conclusions were drawn. In such a case he must either keep to general theories which his auditors do believe, or by inductive methods seek to prove the truth of the general principles themselves.
If in support of our view we quote the opinion of some one whom we believe competent to speak with weight and authority upon the question, we must remember that it will have weight with our audience only if they too look upon the person as an authority. It proves nothing to a body of teachers to say that some educational expert believes as you do unless they have confidence in him as a man of sound judgment. On the other hand, it may count against a proposition to show that it has not been endorsed by any one of importance or prominence.
In a similar way a maxim or proverb may be quoted in support of a proposition. If a boy associates with bad company, we may offer the maxim, "Birds of a feather flock together," in proof that he is probably bad too. Such maxims or proverbs are brief statements of principles generally believed, and the use of them in an argument is in effect the presentation of a general theory in a form which appeals to the mind of the hearer and causes him to believe our proposition.